java操作solr实现查询功能的实例

/**
* solr查询方法
* @param client solr客户端
* @param query solr查询对象
* @return list集合
* @throws SolrServerException 
* @throws IOException
*/
public static List<Map<String, Object>> getSolrQuery(HttpSolrClient client, SolrQuery query) throws SolrServerException, IOException{
List<Map<String, Object>> list = null;
//执行查询并返回结果
QueryResponse resp = client.query(query);
SolrDocumentList results = resp.getResults();
//获取查询到的数据总量
long numFound = results.getNumFound();
//判断总量是否大于0，
if(numFound <= 0) {
//如果小于0，表示未查询到任何数据，返回null
return null;
}else {
//如果大于0，表示有数据
//创建list存储每条数据
list = new ArrayList<>();
//遍历结果集
for (SolrDocument doc : results) {
//得到每条数据的map集合
Map<String, Object> map = doc.getFieldValueMap();
//添加到list
list.add(map);
}
//返回list集合
return list;
}
}

public static void main(String[] args) throws SolrServerException, IOException {
//创建solr客户端连接
HttpSolrClient hsc = new HttpSolrClient.Builder(SOLR_URL).build();
//创建查询对象
SolrQuery query = new SolrQuery();
//设置查询全部数据的条件
//query.setQuery("*:*");
query.setQuery("id:1");

List<Map<String, Object>> list = getSolrQuery(hsc, query);
if(list == null) {
System.out.println("未查询到任何结果");
return;
}
for (Map<String, Object> map : list) {
Iterator<String> it = map.keySet().iterator();
while(it.hasNext()) {
String key = it.next();
Object value = map.get(key);
System.out.println(key+"----"+value);
}
System.out.println("=======================================");
}